Question

For a Broad Gauge route with N+7 sleeper density, the number of sleepers per rail length is:
1. 18
2. 19
3. 20
4. 21 

Answer 1

Correct Answer - Option 3 : 20

Concept 

Sleeper density is denoted by (n + x)

Given Sleeper density as n + 7

Where ‘n’ is the length of one rail

Generally length of one rail (n) = 13 m (Need to remembered) for BG 

∴ Number of sleepers per rail length = 13 + 7 = 20